#ifndef __ENABLE_SSL__

#include <stdlib.h>
#include <string.h>

#include "md5.h"

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5_Transform( u_int32_t [4], unsigned char [64] );
static void Encode( unsigned char *, u_int32_t *, unsigned long );
static void Decode( u_int32_t *, unsigned char *, unsigned long );

static unsigned char PADDING[64] = {
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/* F, G, H and I are basic MD5 functions.
 *  */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
 *  */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
 * Rotation is separate from addition to prevent recomputation.
 *  */
#define FF(a, b, c, d, x, s, ac) { \
    (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
}

#define GG(a, b, c, d, x, s, ac) { \
    (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
}

#define HH(a, b, c, d, x, s, ac) { \
    (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
}

#define II(a, b, c, d, x, s, ac) { \
    (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
}

int MD5_Init( MD5_CTX *context )
{
    context->count[0] = context->count[1] = 0;
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
    return 0;
}

int MD5_Update( MD5_CTX *context, const void *input, unsigned long input_len )
{
    unsigned long i, index, part_len;
    unsigned char *ipt;
    ipt = ( unsigned char * )input;
    /* Compute number of bytes mod 64 */
    index = ( unsigned int )( ( context->count[0] >> 3 ) & 0x3F );

    /* Update number of bits */
    if( ( context->count[0] += ( ( u_int32_t )input_len << 3 ) ) < ( ( u_int32_t )input_len << 3 ) ) {
        context->count[1]++;
    }

    context->count[1] += ( ( u_int32_t )input_len >> 29 );
    part_len = 64 - index;

    /* Transform as many times as possible.
     * */
    if( input_len >= part_len ) {
        memcpy( &( context->buffer[index] ), ipt, part_len );
        MD5_Transform( context->state, context->buffer );

        for( i = part_len; i + 63 < input_len; i += 64 ) {
            MD5_Transform( context->state, &ipt[i] );
        }

        index = 0;
    } else {
        i = 0;
    }

    /* Buffer remaining input */
    memcpy( &( context->buffer[index] ), &( ipt[i] ), input_len - i );
    return 0;
}

int MD5_Final( unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *context )
{
    unsigned char bits[8];
    unsigned long index, pad_len;
    /* Save number of bits */
    Encode( bits, context->count, 8 );
    /* Pad out to 56 mod 64.
     * */
    index = ( unsigned int )( ( context->count[0] >> 3 ) & 0x3f );
    pad_len = ( index < 56 ) ? ( 56 - index ) : ( 120 - index );
    MD5_Update( context, PADDING, pad_len );
    /* Append length (before padding) */
    MD5_Update( context, bits, 8 );
    /* Store state in digest */
    Encode( digest, context->state, MD5_DIGEST_LENGTH );
    /* Zeroize sensitive information.
     * */
    memset( context, 0, sizeof( *context ) );
    return 0;
}

static void MD5_Transform( u_int32_t state[4], unsigned char block[64] )
{
    u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[MD5_DIGEST_LENGTH];
    Decode( x, block, 64 );
    /* Round 1 */
    FF( a, b, c, d, x[ 0], S11, 0xd76aa478 ); /* 1 */
    FF( d, a, b, c, x[ 1], S12, 0xe8c7b756 ); /* 2 */
    FF( c, d, a, b, x[ 2], S13, 0x242070db ); /* 3 */
    FF( b, c, d, a, x[ 3], S14, 0xc1bdceee ); /* 4 */
    FF( a, b, c, d, x[ 4], S11, 0xf57c0faf ); /* 5 */
    FF( d, a, b, c, x[ 5], S12, 0x4787c62a ); /* 6 */
    FF( c, d, a, b, x[ 6], S13, 0xa8304613 ); /* 7 */
    FF( b, c, d, a, x[ 7], S14, 0xfd469501 ); /* 8 */
    FF( a, b, c, d, x[ 8], S11, 0x698098d8 ); /* 9 */
    FF( d, a, b, c, x[ 9], S12, 0x8b44f7af ); /* 10 */
    FF( c, d, a, b, x[10], S13, 0xffff5bb1 ); /* 11 */
    FF( b, c, d, a, x[11], S14, 0x895cd7be ); /* 12 */
    FF( a, b, c, d, x[12], S11, 0x6b901122 ); /* 13 */
    FF( d, a, b, c, x[13], S12, 0xfd987193 ); /* 14 */
    FF( c, d, a, b, x[14], S13, 0xa679438e ); /* 15 */
    FF( b, c, d, a, x[15], S14, 0x49b40821 ); /* 16 */
    /* Round 2 */
    GG( a, b, c, d, x[ 1], S21, 0xf61e2562 ); /* 17 */
    GG( d, a, b, c, x[ 6], S22, 0xc040b340 ); /* 18 */
    GG( c, d, a, b, x[11], S23, 0x265e5a51 ); /* 19 */
    GG( b, c, d, a, x[ 0], S24, 0xe9b6c7aa ); /* 20 */
    GG( a, b, c, d, x[ 5], S21, 0xd62f105d ); /* 21 */
    GG( d, a, b, c, x[10], S22,  0x2441453 ); /* 22 */
    GG( c, d, a, b, x[15], S23, 0xd8a1e681 ); /* 23 */
    GG( b, c, d, a, x[ 4], S24, 0xe7d3fbc8 ); /* 24 */
    GG( a, b, c, d, x[ 9], S21, 0x21e1cde6 ); /* 25 */
    GG( d, a, b, c, x[14], S22, 0xc33707d6 ); /* 26 */
    GG( c, d, a, b, x[ 3], S23, 0xf4d50d87 ); /* 27 */
    GG( b, c, d, a, x[ 8], S24, 0x455a14ed ); /* 28 */
    GG( a, b, c, d, x[13], S21, 0xa9e3e905 ); /* 29 */
    GG( d, a, b, c, x[ 2], S22, 0xfcefa3f8 ); /* 30 */
    GG( c, d, a, b, x[ 7], S23, 0x676f02d9 ); /* 31 */
    GG( b, c, d, a, x[12], S24, 0x8d2a4c8a ); /* 32 */
    /* Round 3 */
    HH( a, b, c, d, x[ 5], S31, 0xfffa3942 ); /* 33 */
    HH( d, a, b, c, x[ 8], S32, 0x8771f681 ); /* 34 */
    HH( c, d, a, b, x[11], S33, 0x6d9d6122 ); /* 35 */
    HH( b, c, d, a, x[14], S34, 0xfde5380c ); /* 36 */
    HH( a, b, c, d, x[ 1], S31, 0xa4beea44 ); /* 37 */
    HH( d, a, b, c, x[ 4], S32, 0x4bdecfa9 ); /* 38 */
    HH( c, d, a, b, x[ 7], S33, 0xf6bb4b60 ); /* 39 */
    HH( b, c, d, a, x[10], S34, 0xbebfbc70 ); /* 40 */
    HH( a, b, c, d, x[13], S31, 0x289b7ec6 ); /* 41 */
    HH( d, a, b, c, x[ 0], S32, 0xeaa127fa ); /* 42 */
    HH( c, d, a, b, x[ 3], S33, 0xd4ef3085 ); /* 43 */
    HH( b, c, d, a, x[ 6], S34,  0x4881d05 ); /* 44 */
    HH( a, b, c, d, x[ 9], S31, 0xd9d4d039 ); /* 45 */
    HH( d, a, b, c, x[12], S32, 0xe6db99e5 ); /* 46 */
    HH( c, d, a, b, x[15], S33, 0x1fa27cf8 ); /* 47 */
    HH( b, c, d, a, x[ 2], S34, 0xc4ac5665 ); /* 48 */
    /* Round 4 */
    II( a, b, c, d, x[ 0], S41, 0xf4292244 ); /* 49 */
    II( d, a, b, c, x[ 7], S42, 0x432aff97 ); /* 50 */
    II( c, d, a, b, x[14], S43, 0xab9423a7 ); /* 51 */
    II( b, c, d, a, x[ 5], S44, 0xfc93a039 ); /* 52 */
    II( a, b, c, d, x[12], S41, 0x655b59c3 ); /* 53 */
    II( d, a, b, c, x[ 3], S42, 0x8f0ccc92 ); /* 54 */
    II( c, d, a, b, x[10], S43, 0xffeff47d ); /* 55 */
    II( b, c, d, a, x[ 1], S44, 0x85845dd1 ); /* 56 */
    II( a, b, c, d, x[ 8], S41, 0x6fa87e4f ); /* 57 */
    II( d, a, b, c, x[15], S42, 0xfe2ce6e0 ); /* 58 */
    II( c, d, a, b, x[ 6], S43, 0xa3014314 ); /* 59 */
    II( b, c, d, a, x[13], S44, 0x4e0811a1 ); /* 60 */
    II( a, b, c, d, x[ 4], S41, 0xf7537e82 ); /* 61 */
    II( d, a, b, c, x[11], S42, 0xbd3af235 ); /* 62 */
    II( c, d, a, b, x[ 2], S43, 0x2ad7d2bb ); /* 63 */
    II( b, c, d, a, x[ 9], S44, 0xeb86d391 ); /* 64 */
    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;
    /* Zeroize sensitive information.
     *
     * */
    memset( x, 0, sizeof( x ) );
}

static void Encode( unsigned char *output, u_int32_t *input, unsigned long len )
{
    unsigned long i, j;

    for( i = 0, j = 0; j < len; i++, j += 4 ) {
        output[j] = ( unsigned char )( input[i] & 0xff );
        output[j + 1] = ( unsigned char )( ( input[i] >> 8 ) & 0xff );
        output[j + 2] = ( unsigned char )( ( input[i] >> 16 ) & 0xff );
        output[j + 3] = ( unsigned char )( ( input[i] >> 24 ) & 0xff );
    }
}

static void Decode( u_int32_t *output, unsigned char *input, unsigned long len )
{
    unsigned long i, j;

    for( i = 0, j = 0; j < len; i++, j += 4 )
        output[i] = ( ( u_int32_t )input[j] ) | ( ( ( u_int32_t )input[j + 1] ) << 8 ) |
                    ( ( ( u_int32_t )input[j + 2] ) << 16 ) | ( ( ( u_int32_t )input[j + 3] ) << 24 );
}

#endif //__ENABLE_SSL__

